(19)
(11) EP 3 701 146 A1

(12)

(43) Date of publication:
02.09.2020 Bulletin 2020/36

(21) Application number: 18793092.0

(22) Date of filing: 01.10.2018
(51) International Patent Classification (IPC): 
F03G 7/00(2006.01)
F02G 1/043(2006.01)
B64G 1/42(2006.01)
(86) International application number:
PCT/US2018/053734
(87) International publication number:
WO 2019/083691 (02.05.2019 Gazette 2019/18)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30) Priority: 27.10.2017 US 201715795657

(71) Applicant: Northrop Grumman Systems Corporation
Falls Church, VA 22042-4511 (US)

(72) Inventor:
  • PETACH, Michael, B.
    Redondo Beach, CA 90277 (US)

(74) Representative: CSY Herts 
Helios Court 1 Bishop Square
Hatfield, Hertfordshire AL10 9NE
Hatfield, Hertfordshire AL10 9NE (GB)

   


(54) TOROIDAL SPIRAL CASCADING OF MULTIPLE HEAT ENGINE STAGES IN TRAVELING WAVE THERMOACOUSTIC ENGINES